.page-about {
  --timeline-line-color: var(--clr-accent, #C8962E);
  --timeline-node-size: 56px;
  --timeline-line-width: 3px;
}

/* ── 面包屑 ── */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.6rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 1rem 1.25rem 0;
  font-family: var(--font-body, Georgia, serif);
  font-size: 0.85rem;
  color: var(--clr-text, #1A1A1A);
}
.page-about .breadcrumb a {
  color: var(--clr-primary, #1B4D3E);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast, 0.2s ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  border-color: var(--clr-accent, #C8962E);
}
.page-about .breadcrumb__sep {
  color: var(--clr-border, #BFA76A);
  font-size: 1.2rem;
  line-height: 1;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--clr-accent, #C8962E);
  font-weight: 700;
}

/* ── 品牌故事 ── */
.page-about .brand-story__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}
.page-about .brand-story__text {
  order: 1;
}
.page-about .brand-story__headline {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 2.8rem;
  font-weight: 900;
  line-height: 1.05;
  color: var(--clr-primary, #1B4D3E);
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
}
.page-about .brand-story__tagline {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--clr-accent, #C8962E);
  margin: 0 0 1.2rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.page-about .brand-story__desc {
  font-family: var(--font-body, Georgia, serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-text, #1A1A1A);
  max-width: 58ch;
}
.page-about .brand-story__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.6rem;
}
.page-about .brand-story__visual {
  order: 0;
  display: flex;
  justify-content: center;
}
.page-about .brand-story__img {
  max-width: 100%;
  height: auto;
  border: var(--border-thick, 4px solid #BFA76A);
  box-shadow: var(--shadow-strong, 8px 8px 0 rgba(27,77,62,0.25));
  object-fit: cover;
  aspect-ratio: 3 / 2;
}
.page-about .frame-viewport {
  border: var(--border-thick, 4px solid #BFA76A);
  box-shadow: var(--shadow-strong, 8px 8px 0 rgba(27,77,62,0.25));
  background: var(--clr-white, #FFFFFF);
  margin: 1.25rem;
  padding: 0;
  position: relative;
}
.page-about .frame-viewport .container {
  padding: 1.5rem 1.25rem;
}
.page-about .frame-viewport__inner {
  position: relative;
  z-index: 1;
}

/* ── 通用 section ── */
.page-about .section {
  padding: var(--spacing-section, 2.5rem) 0;
  position: relative;
}
.page-about .section__header {
  margin-bottom: 2rem;
  text-align: center;
}
.page-about .section__title {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--clr-primary, #1B4D3E);
  margin: 0 0 0.4rem;
  text-transform: uppercase;
  letter-spacing: -0.01em;
  line-height: 1.1;
}
.page-about .section__subtitle {
  font-family: var(--font-body, Georgia, serif);
  font-size: 1.05rem;
  color: var(--clr-text, #1A1A1A);
  opacity: 0.8;
  margin: 0;
}
.page-about .container {
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ── 服务内容 ── */
.page-about .services__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
.page-about .services__card {
  display: flex;
  flex-direction: column;
  padding: 1.5rem;
  border: var(--border-thick-primary, 4px solid #1B4D3E);
  box-shadow: var(--shadow-strong, 8px 8px 0 rgba(27,77,62,0.25));
  background: var(--clr-white, #FFFFFF);
  transition: transform var(--transition-med, 0.35s ease), box-shadow var(--transition-med, 0.35s ease);
}
.page-about .services__card:hover,
.page-about .services__card:focus-within {
  transform: translate(-3px, -3px);
  box-shadow: 11px 11px 0 rgba(27,77,62,0.25);
}
.page-about .card__icon {
  color: var(--clr-accent, #C8962E);
  margin-bottom: 0.8rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 2px solid var(--clr-accent, #C8962E);
}
.page-about .card__icon svg {
  width: 32px;
  height: 32px;
}
.page-about .card__title {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--clr-primary, #1B4D3E);
  margin: 0 0 0.6rem;
  letter-spacing: 0.02em;
}
.page-about .card__body {
  font-family: var(--font-body, Georgia, serif);
  font-size: 0.95rem;
  line-height: 1.65;
  color: var(--clr-text, #1A1A1A);
  flex: 1;
}
.page-about .card__link {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  font-family: var(--font-body, Georgia, serif);
  font-weight: 700;
  color: var(--clr-accent, #C8962E);
  text-decoration: none;
  margin-top: 1rem;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease);
  align-self: flex-start;
}
.page-about .card__link:hover,
.page-about .card__link:focus-visible {
  border-bottom-color: var(--clr-accent, #C8962E);
  color: var(--clr-primary, #1B4D3E);
}
.page-about .services__visual {
  display: flex;
  justify-content: center;
  margin-top: 1rem;
}
.page-about .services__chart {
  max-width: 100%;
  height: auto;
  border: var(--border-thick, 4px solid #BFA76A);
  box-shadow: var(--shadow-accent, 6px 6px 0 rgba(200,150,46,0.3));
  object-fit: cover;
  aspect-ratio: 10 / 7;
}
.page-about .diagonal-bg {
  position: relative;
}
.page-about .diagonal-bg::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 12px,
    rgba(27,77,62,0.04) 12px,
    rgba(27,77,62,0.04) 13px
  );
  pointer-events: none;
  z-index: 0;
}
.page-about .diagonal-bg > .container {
  position: relative;
  z-index: 1;
}

/* ── 版本更新历程 ── */
.page-about .timeline {
  position: relative;
  padding-left: 2.2rem;
  max-width: 720px;
  margin: 0 auto;
}
.page-about .timeline::before {
  content: '';
  position: absolute;
  left: 27px;
  top: 0;
  bottom: 0;
  width: var(--timeline-line-width, 3px);
  background: var(--timeline-line-color, #C8962E);
  border-radius: 2px;
}
.page-about .timeline__node {
  position: relative;
  display: flex;
  flex-direction: column;
  padding-bottom: 2.2rem;
  cursor: default;
}
.page-about .timeline__node:last-child {
  padding-bottom: 0;
}
.page-about .timeline__icon {
  position: absolute;
  left: calc(-2.2rem - 20px);
  top: 0;
  width: var(--timeline-node-size, 56px);
  height: var(--timeline-node-size, 56px);
  border-radius: 50%;
  background: var(--clr-white, #FFFFFF);
  border: var(--timeline-line-width, 3px) solid var(--timeline-line-color, #C8962E);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--clr-accent, #C8962E);
  box-shadow: 0 0 0 4px var(--clr-white, #FFFFFF);
  z-index: 1;
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease), transform var(--transition-fast, 0.2s ease);
}
.page-about .timeline__icon svg {
  width: 26px;
  height: 26px;
}
.page-about .timeline__node:hover .timeline__icon,
.page-about .timeline__node:focus-within .timeline__icon {
  background: var(--clr-accent, #C8962E);
  color: var(--clr-white, #FFFFFF);
  transform: scale(1.08);
}
.page-about .timeline__content {
  background: var(--clr-white, #FFFFFF);
  border: 2px solid var(--clr-border, #BFA76A);
  padding: 1rem 1.2rem;
  box-shadow: var(--shadow-strong, 8px 8px 0 rgba(27,77,62,0.15));
  transition: box-shadow var(--transition-med, 0.35s ease), border-color var(--transition-med, 0.35s ease);
}
.page-about .timeline__node:hover .timeline__content,
.page-about .timeline__node:focus-within .timeline__content {
  border-color: var(--clr-accent, #C8962E);
  box-shadow: var(--shadow-accent, 6px 6px 0 rgba(200,150,46,0.25));
}
.page-about .timeline__title {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--clr-primary, #1B4D3E);
  margin: 0 0 0.3rem;
  letter-spacing: 0.01em;
}
.page-about .timeline__desc {
  font-family: var(--font-body, Georgia, serif);
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--clr-text, #1A1A1A);
  margin: 0;
}
.page-about .timeline__detail {
  font-family: var(--font-body, Georgia, serif);
  font-size: 0.85rem;
  line-height: 1.55;
  color: var(--clr-text, #1A1A1A);
  margin-top: 0.6rem;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--clr-gray-mid, #CCCCCC);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height var(--transition-med, 0.35s ease), opacity var(--transition-med, 0.35s ease), padding var(--transition-med, 0.35s ease);
}
.page-about .timeline__node:hover .timeline__detail,
.page-about .timeline__node:focus-within .timeline__detail {
  max-height: 200px;
  opacity: 1;
  padding-top: 0.6rem;
}
.page-about .timeline__footnote {
  text-align: center;
  margin-top: 2.5rem;
}

/* ── 数据承诺 ── */
.page-about .commitment__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.8rem;
  margin-bottom: 2rem;
}
.page-about .commitment__item {
  text-align: center;
  padding: 1.8rem 1.2rem;
  border: var(--border-thick, 4px solid #BFA76A);
  background: var(--clr-white, #FFFFFF);
  box-shadow: var(--shadow-strong, 8px 8px 0 rgba(27,77,62,0.25));
  transition: transform var(--transition-med, 0.35s ease), box-shadow var(--transition-med, 0.35s ease);
}
.page-about .commitment__item:hover {
  transform: translate(-3px, -3px);
  box-shadow: 11px 11px 0 rgba(27,77,62,0.25);
}
.page-about .commitment__icon {
  color: var(--clr-accent, #C8962E);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  margin-bottom: 0.8rem;
  border-radius: 50%;
  border: 2px solid var(--clr-accent, #C8962E);
}
.page-about .commitment__icon svg {
  width: 32px;
  height: 32px;
}
.page-about .commitment__title {
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--clr-primary, #1B4D3E);
  margin: 0 0 0.5rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
}
.page-about .commitment__text {
  font-family: var(--font-body, Georgia, serif);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--clr-text, #1A1A1A);
  max-width: 42ch;
  margin: 0 auto;
}
.page-about .commitment__trust {
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  border: 2px solid var(--clr-accent, #C8962E);
  background: var(--clr-gray-light, #F2F2F2);
}
.page-about .commitment__statement {
  font-family: var(--font-body, Georgia, serif);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--clr-primary, #1B4D3E);
  font-style: italic;
  margin: 0;
}

/* ── 按钮 ── */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.6rem;
  font-family: var(--font-heading, Impact, 'Arial Black', sans-serif);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  text-decoration: none;
  border: 3px solid transparent;
  cursor: pointer;
  transition: background var(--transition-fast, 0.2s ease), color var(--transition-fast, 0.2s ease), border-color var(--transition-fast, 0.2s ease), transform var(--transition-fast, 0.2s ease);
  line-height: 1.2;
}
.page-about .btn-primary {
  background: var(--clr-accent, #C8962E);
  color: var(--clr-white, #FFFFFF);
  border-color: var(--clr-accent, #C8962E);
}
.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background: var(--clr-primary, #1B4D3E);
  border-color: var(--clr-primary, #1B4D3E);
  transform: scale(1.02);
}
.page-about .btn-outline {
  background: transparent;
  color: var(--clr-primary, #1B4D3E);
  border-color: var(--clr-primary, #1B4D3E);
}
.page-about .btn-outline:hover,
.page-about .btn-outline:focus-visible {
  background: var(--clr-primary, #1B4D3E);
  color: var(--clr-white, #FFFFFF);
  transform: scale(1.02);
}

/* ── 桌面端 ≥768px ── */
@media (min-width: 768px) {
  .page-about .brand-story__headline {
    font-size: 3.6rem;
  }
  .page-about .brand-story__tagline {
    font-size: 1.5rem;
  }
  .page-about .brand-story__layout {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
  .page-about .brand-story__text {
    order: 0;
  }
  .page-about .brand-story__visual {
    order: 1;
    align-items: flex-start;
    margin-top: 2rem;
  }
  .page-about .frame-viewport .container {
    padding: 2rem 2.5rem;
  }
  .page-about .section__title {
    font-size: 2.8rem;
  }
  .page-about .services__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
  .page-about .services__card {
    padding: 1.8rem 1.5rem;
  }
  .page-about .services__visual {
    margin-top: 2rem;
  }
  .page-about .timeline {
    padding-left: 3.5rem;
  }
  .page-about .timeline::before {
    left: 34px;
  }
  .page-about .timeline__icon {
    left: calc(-3.5rem - 20px);
    width: 64px;
    height: 64px;
  }
  .page-about .timeline__icon svg {
    width: 30px;
    height: 30px;
  }
  .page-about .timeline__content {
    padding: 1.2rem 1.5rem;
  }
  .page-about .timeline__title {
    font-size: 1.3rem;
  }
  .page-about .timeline__desc {
    font-size: 0.95rem;
  }
  .page-about .timeline__detail {
    font-size: 0.9rem;
  }
  .page-about .commitment__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
  .page-about .commitment__item {
    padding: 2rem 1.5rem;
  }
  .page-about .commitment__title {
    font-size: 1.35rem;
  }
}

/* ── 桌面端 ≥1024px ── */
@media (min-width: 1024px) {
  .page-about .brand-story__headline {
    font-size: 4.2rem;
  }
  .page-about .brand-story__tagline {
    font-size: 1.6rem;
  }
  .page-about .brand-story__desc {
    font-size: 1.05rem;
  }
  .page-about .section__title {
    font-size: 3rem;
  }
  .page-about .section__subtitle {
    font-size: 1.1rem;
  }
  .page-about .frame-viewport {
    margin: 2rem auto;
    max-width: calc(var(--max-width, 1200px) + 3rem);
  }
  .page-about .frame-viewport .container {
    padding: 2.5rem 3rem;
  }
}

/* ── 移动端溢出防护 ── */
@media (max-width: 480px) {
  .page-about .frame-viewport {
    margin: 0.75rem;
  }
  .page-about .brand-story__headline {
    font-size: 2rem;
  }
  .page-about .brand-story__tagline {
    font-size: 1rem;
  }
  .page-about .section__title {
    font-size: 1.6rem;
  }
  .page-about .timeline {
    padding-left: 1.8rem;
  }
  .page-about .timeline::before {
    left: 20px;
  }
  .page-about .timeline__icon {
    left: calc(-1.8rem - 16px);
    width: 44px;
    height: 44px;
  }
  .page-about .timeline__icon svg {
    width: 20px;
    height: 20px;
  }
  .page-about .commitment__item {
    padding: 1.2rem 0.8rem;
  }
}

/* ── 减少 motion ── */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
  .page-about .services__card:hover,
  .page-about .services__card:focus-within {
    transform: none;
  }
  .page-about .commitment__item:hover {
    transform: none;
  }
  .page-about .timeline__node:hover .timeline__icon,
  .page-about .timeline__node:focus-within .timeline__icon {
    transform: none;
  }
  .page-about .timeline__detail {
    max-height: none;
    opacity: 1;
    padding-top: 0.6rem;
    border-top: 1px dashed var(--clr-gray-mid, #CCCCCC);
  }
}